Back ferrule

ABSTRACT

A ferrule for a metal tube fitting includes a body having a cylindrical interior wall that extends through the ferrule from a front end to a back end, a circumferential recess in the cylindrical interior wall so that the cylindrical interior wall has a first cylindrical portion that is axially forward of the recess and a second cylindrical portion that is axially rearward of the recess. The body includes a nose portion with a tapered outer surface and a flange. The body also includes an outer wall having a first outer wall portion that extends from the tapered outer surface of the nose portion. The first outer wall portion extending rearward to a tapered outer wall portion, the tapered outer wall portion extending from the first outer wall portion to the flange, the diameter of the first cylindrical portion being less than the diameter of the second cylindrical portion.

FIG. 1 is a left side elevational view of a back ferrule, the right side elevational, top plan, and bottom plan views being identical thereto;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a cross-sectional view thereof, taken along the line 4-4 of FIG. 3. 

CLAIM We claim the ornamental design for a back ferrule, as shown and described. 